code: def setUp(self):
      class A(traitlets.HasTraits):
          initial_viewport = maps.InitialViewport()
  
      self.A = A
  
file_path: gmaps/gmaps/tests/test_maps.py
imports: import unittest
  import traitlets
  from ..None import maps, heatmap_layer
label_desc: Use image node_id 1 for calling the InitialViewport obj's underlying member method code with example usage: obj.setUp() without return types